50 here ... and happily Rowan (who is in his 60s) and I did a 500 km weekend over Easter, last Easter.
In brief ...
300 km ride on Good Friday.
Supporting a 300 km ride on Saturday.
200 km ride on Easter Sunday.
The full story here:
2017 Randonnees
2017 Randonnees
And then, at the end of June/beginning of July, Rowan and I rode one of the most challenging 200Ks I've ever done one weekend, and a 150 km + 10 km on July 1 (Canada Day)
The stories of those rides are on this page:
2017 Randonnees
Last year we rode a 400km ... then I came down with measles, followed up by the flu, and almost the second I was feeling better, we attempted a 600 km, but unfortunately the lack of cycling caught up with me, in particular, and we only managed about 400 km of the 600 km.
But I'm so pleased that we're back into the long distance stuff again. We're not letting age be an excuse.