63 yo, 5'8" at 138 lb. Used to wear only shorts. But now I only wear bibs for cycling. Much more comfortable and I don't have to worry when my jersey rides up my back. I've got three different brands of bibs. Least favorite are the PI bibs, thinnest are the Castelli and my favorite have got to be my Assos bibs.
For triathlons I wear a two piece Tri Kit.