Bought my first one at 45, Aero 8 S3, now 53 and about to increment once more.
Bought my second one at 50, M3W, which is fund at half the speed, but I only want to cover 1/10 the distance before getting out.
Perhaps, at 55 next summer, I should be looking to get a new Aero 8 - we'll see! Depends on some financial investments moving in the right direction...
Hope to buy my last Morgan at about 75, so this will remain newish until I'm about 80 after which I will clean them more and drive them less and less I guess.