This is a great story from Athletics Weekly about an English steeplechaser from the 1956 and 1960 Olympics who is still competing today at age 91. Some highlights:
https://athleticsweekly.com/athletics-news/eric-shirleys-rise-from-rags-to-running-royalty-1039937967/Eric Shirley’s name first appeared in the pages of AW in February 1946, when the magazine was just three months old. Aged 16, he won the Middlesex youths’ cross-country title in Cranford and, amazingly, his results are still being published today as an athlete in the over-90 age group.
...
Shirley was born into a workhouse in Epsom on April 3, 1929, to a 19-year-old single domestic servant. Almost immediately, he was given away with no formal adoption to a middle-aged Irishwoman before being sent at the age of nine to live with the woman’s childless sister in a damp and miserable shack near Abbeyleix in Ireland.
There was no gas, electricity, running water or toilet facilities and, even now, he finds it difficult to talk about.
It's amazing what he overcame, and we can only hope we are all doing so well at 91.