Nah. More like early thirties. Average life expectancy in the dark ages was 30 or something, but that's just because most people died very young, mostly as babies. If you managed to grow up at all, you could reach your 50s or 60s.

Unless you're in the middle of a major plague or have a ridiculous amount of war, peasants in a medieval-style world who survive young childhood should generally get to an age of about 60. Though getting old with medieval-level medicine while working a physically demanding job probably sucks hard.