Smyslov is another one who played very well into old age.

If you win the FIDE Senior World Championship, you become GM.  According to Wikipedia, Lawrence Charles Kaufman (born 1947) was automatically awarded the title Grandmaster by FIDE after winning the 2008 World Senior Championship.

Several players have been awarded honorary or retrospective grandmaster titles based on their past achievements. The oldest of these was Enrico Paoli, who was awarded the title in 1996 at the age of 88.

Apart from retrospective awards, a number of players have achieved the title by winning the World Senior Championship. The oldest player to gain the title in this way was Yuri Shabanov, who won the 2003 event and was awarded the title at the age of 66.

How am i supose to know? I am only 9

O my gasoline diesel

I will be 42 in this December and going for the Grandmaster title. You can follow my road at https://www.chess.com/blog/attilaturzo

Enrico Paoli (January 13, 1908 – December 15, 2005) was an Italian international chess master. He was 88 y/o when he achieved his GM title on 1996.

He was born in Trieste, Italy, and learned chess when he was nine years old. He was the winner of international tournaments in Vienna (1951) and Imperia (1959).[2] Paoli won his last Italian Championship at age 60, and organized the famous Reggio Emilia chess tournament. He beat Soviet GM Alexander Kotov with the black pieces in Venice in 1950, but missed receiving the Grandmaster title by only half a point at a tournament in 1969. He was awarded an honorary grandmaster title in 1996 by FIDE.

So to summarize, Enrico Paoli was the oldest to be awarded a GM title based on past achievements at age 88.

Ossip Bernstein was awarded the GM title in 1950 at age 68, and was probably still playing at a GM level at the time.  1950 was the first time FIDE awarded GM titles.

Yuri Shabanov was the oldest to be awarded the GM title for winning the world senior championship at age 66.

Valery Grechikhin was the oldest to be awarded the GM title for norms in tournaments at age 61.  (Vladislav Vorotnikov was 58).

With the recent passing of Yuri Averbach who is the oldest living Grandmaster currently?

Aleksandar Matanović

People mentioned that Valery Grechikhin was the oldest to get the GM with normsIt seems that he got the IM title at age 59 and the GM title at age 61 but based on his fide rating I believe that he was at least IM strength earlier.
http://www.olimpbase.org/Elo/player/Grechihin,%20Valery.html 

The oldest person to become a Grandmaster via norms and hitting 2500 in rating is Nikolai Shalnev. He was 57 years old when he got his third GM norm in the Spring 2001 tournament in Odessa, Ukraine, at which point his FIDE rating was 2550.

https://chess.stackexchange.com/questions/27049/who-is-the-oldest-person-to-become-a-gm-via-norms-and-hitting-2500-in-rating

@51

Aleksandar Matanović passed away.
The oldest living grandmasters are Kraidman, Yair and Nikolac, Juraj, both born 1932.

I believe the oldest to achieve the GM title through FIDE’s standard three norms + 2500 rating requirement is Nikolai Shalnev, who accomplished the deed at the age of 57 in 2001. Someone else won the Senior World Championship which grants you the GM title without doing the three norms. He was 66. Others have posthumously awarded the title for play in the younger's years. Presumably before the modern rating system. ***Edit: I just saw the post two spots ahead of me sharing the same information***

Another honourable mention for great playing in their later years, but not the oldest to achieve GM, is Vasily Smyslov. In 1983, at the age of 62, he went through to the Candidates' Final (the match to determine who plays the champion, Anatoly Karpov), losing 8½–4½ at Vilnius 1984 to Garry Kasparov, who was 21 at the time. He had previously been World Champion at age 36 when he defeated Botvinnik in 1957.

Someday there will be GM title by paying some money. Maybe

Or by completing some task (chess puzzle for example). After completing it, he got GM title. OR you beating a bot with 2500 rated.

Could be happen someday. Because the demand to be a GM is huge and somehow people will find a way to make it happen. And also it means huge money too for the organization ^^

That would be a terrible shame and degradation of the GM title if it ever becomes fee based. Having said that they could make a paid title but don't make it GM. Maybe PGM (Paid my way Grand Master!)

Enrico Paoli – Awarded at about 88 years old
Jacques Mieses – Awarded in 1950 at roughly 85 years old
George Koltanowski – Awarded an honorary GM title around age 85
Mario Monticelli – Awarded honorary GM at about 83
Vladimir Makogonov – Awarded honorary GM at about 83
Géza Maróczy – Awarded (retroactively) in 1950 at approximately 80
Akiba Rubinstein – Awarded in 1950 at around 70
Ossip Bernstein – Awarded in 1950 at roughly 68
Yuri Shabanov – Earned the GM title via winning the World Senior Championship at about 66
Oldřich Duras – Awarded in 1950 at about 65
Milan Vidmar – Awarded in 1950 at roughly 65
Savielly Tartakower – Awarded in 1950 at about 63
Valery Grechikhin – Became GM (non–senior event) at roughly 60
Boris Kostić – From the inaugural crop, he was around 59
Igor Ivanov – Achieved his norms in his late 50s (≈57–58)
Vladislav Vorotnikov – Achieved GM norms around 57–58
Nikolai Shalnev – Earned his final norm at about 56
Leif Øgaard – Became GM at roughly 55
Grigory Levenfish – Awarded in 1950 at about 55
Mark Tseitlin – Achieved his final norm at approximately 54
Note: These ages are approximate; different sources sometimes report slight variations. Also, the list mixes players awarded in FIDE’s initial 1950 “inaugural” batch (often recognized later for past achievements) with those earning norms decades afterward. Nonetheless, this is one way to list the “oldest‐to‐youngest” 20 entries from that Wikipedia compilation.

This more interesting in my opinion :

Below is what I could establish from the published discussions and analyses. (Note that when we require that only non‐honorary, norm‐based GM titles awarded “in our modern era” (that is, from 1990 onward) be included, very few players fall into the “older‐at‐award” category. In fact, almost all strong players earn the GM title in their 20s or 30s. Based on the online sources I reviewed, only a handful of cases remain where a player earned his (norm‐based) GM title at a relatively “advanced” age (that is, 50 or more) after 1990. Here’s what I found, sorted from the oldest down to the youngest among those examples:)

Valery Grechikhin – A non–world‑senior–winner GM who (according to several chess‐forum contributors) earned his norm(s) and title at about 60–61 years old.
Nikolai Shalnev – He completed his final GM norm in a Spring 2001 tournament in Odessa at roughly 57 years old (with a FIDE rating around 2550).
Igor Ivanov – Reported to have achieved his GM norms in his late 50s (around 57–58 years old).
Vladislav Vorotnikov – Also noted as achieving the GM norm milestones in the 57–58‐year range.
Leif Øgaard – Although his first two norms date from the early 1980s, his GM title was finally awarded in 2007—making him about 55 at the time.
Because norm‐based (. “earned by play”) GM titles in the modern era almost universally occur when players are much younger, there isn’t a full “top 20” list meeting the criteria (non‑honorary and awarded from 1990 onward). In most cases the vast majority of GM titles since 1990 have been earned by players in their 20s or 30s.

Thus, among the later “late bloomers” who reached the GM level by norms after 1990, these five examples appear to be the only ones in the higher age bracket. (If one were to list the 20 “oldest” norm‐based GM awards since 1990, almost all of the remaining names would fall into the “young” category—typically between 20 and 40 years old.)