Interesting that only 37 is the highest at his age.
As was noted, Gordie Howe scored 44 goals at age 40, but that was mainly due to mass expansion shortly before. Still very impressive, though.
The Caps' 20th-place finish in offense last season was their lowest placing since 2006 (though 2011 was close, at 19th). I don't follow the Caps enough to know how good / bad they are, but I think if they're depending on Dylan Strome to be their top center, then they're in for a tough season offensively. And a team struggling to win gets few empty-net opportunities (for Ovi to score).
Still, there's the PP. The Caps maintained a more-or-less League-average PP last season, so if they can do that again, Ovi will get his goals. If he can manage around 14-15 PP goals next season, then even a decline at ES from, say, 28 to 20, would still give him about 35 goals on the season.
I say, around 35.