Mojo didn't start lifting his leg until he was like 6 1/2yrs old. lol Luckily it has never transferred to inside, just outside. Faust never has lifted his leg and he's 7yrs old now. Tenchi did it once on our couch at 4.5months... we got him neutered within days.
He has yet to lift his leg again! lol I bet he's worried we might remove something else.
On the other hand, Ms Superpsycho Zeo lifts her leg all the time! She has to pee over where everyone else goes. Then there's Miz Kida B the rat dog. She doesn't really lift her leg, but she leans pretty far and has to mark over everyone else... even Zeo.
Gyrl? She doesn't lift or mark, but I'm lucky if she makes it outside at 13+years. ;P