Top 10 Oldest Active Football (Soccer) Players in History

The Top Ten

1 Dave Beasant

David John Beasant (born 20 March 1959) is an English former football goalkeeper. He began his career in the late 1978. Beasant's former clubs include Edgware Town, Wimbledon, Newcastle United, Chelsea, Southampton, Nottingham Forest, Portsmouth, Tottenham Hotspur, Brighton & Hove Albion and Wigan Athletic.
He made two appearances for the England national football team. On 10 May 2015, Beasant became the oldest individual to be selected in the squad for a match in Football League history while representing Stevenage as a substitute against Southend in the League Two Play-Off semi-final second leg, at the age of 56.

This is really surprising. most players retire at the age of 35-37. but even at the age of 57 he's still carrying on.

2 Andy Legg
3 Rivaldo
4 John Burridge
5 Marco Ballotta
6 Teddy Sheringham Edward Paul Sheringham MBE is an English football manager and former player. Sheringham played as a forward, mostly as a second striker, in a 24-year professional career.
7 Aleksandar Đurić
8 Faryd Mondragón
9 Andrea Pierobon
10 Kazuyoshi Miura

The first great player that played till his half century age was BILLY MEREDITH.
He was considered one of the early superstars of football due to his performances, notably for Manchester City and Manchester United. His position was outside right. He won each domestic trophy in the English football league and gained 48 caps for Wales, for whom he scored 11 goals in the period 1895-1920. The last performance was at the age of 46.
His professional career lasted 34 years and ended at the age of 50.

Kazuyoshi Miura (born 26 February 1967), is a Japanese footballer who plays (as of November 2019) as a forward for Yokohama FC in the J2 League. He played for the Japanese national team from 1990 to 2000, and was the first Japanese recipient of the Asian Footballer of the Year award in 1993. Miura, was Japan's first superstar in football.
His senior career started in 1986 in Brazil. On 5 March 2017, Miura became the oldest ever player to feature in a professional match when he started in Yokohama's 1-1 draw against V-Varen Nagasaki. With 50 years and seven days, he surpassed the previous record held by Stanley Matthews from 1965 by two days. Seven days later, he broke Matthews' record for oldest goalscorer in professional football when he struck the only goal of a 1-0 win over Thespakusatsu Gunma.

As usually happens with various sources, the one that this list is based on is absolutely unreliable :

STANLEY MATTHEWS : retired at the age of 50 (1965) concecutively playing professionally for 33 years. A legend of the game.

PETER SHILTON : retired at the age of 48 (1997), and holds the all-time record for the most competitive appearances in world football - 1390.

TULIO MARAVILHA : The Brazilian journeyman (31 clubs) retired at the age of 50 (2019), or at least it seems so, as he was first retired in 2014 and returned in 2018 for one year in the Clube Atlético Taboão da Serra (Brazilian third division). He played four official matches and scored one goal (according to him the 1,001 of his career).