Yep, and I never edited him, hard as that may be to believe. I did edit some of my other stars recently, like David Griffin and Tommy John, to stave off the aging process a little, but Ollie is working without the benefit of PEEs (Performance-Enhancing Edits).
It probably helps his W-L record that his team is really good (No fewer than 130 wins the first three seasons!) but the ERA, WHIP, and Ks are all on him. Having a Gold Glove catcher might have helped him a little, but still...yep, the OOTP fictional answer to Nolan Ryan. His stamina does seem to be wearing down a bit, though. Note how he only threw 75 pitches in his last start, and has pitched only 19.1 innings in four starts. I'm thinking '89 might be his swan song, but I've been wrong about the guy before.
It's not quite unprecedented for late-30s-early 40s guys to still perform at a high rate. Bert Blyleven still manages to win 15-ish games every year in his late 30s, even on bad Cleveland and Minnesota teams.