There's hope for us all.
I've just been reading about Fauja Singh, an elderly Sikh gentleman from London. He retired from competitive running in February AGED 102, after completing the Hong Kong 10k race 5 minutes quicker than last year, despite falling over and getting up and continuing the race . He took up running at 89 and still runs for "fun" every day. In his interview he sounds really bright-eyed and bushy-tailed.
I certainly won't be running when I'm 102 (but then, I don't run now) but I hope I'm that fit when I'm that age.