Refs in Life History section 

Fin, sei, and Bryde's are all baleen whales. The cited sources mentioning those species give age at physical maturity (20-25 for Bryde's, 25 for seis, and 25-30 for fin whales, iirc). Evans gives age at sexual maturity, duration of lactation and gestation, etc. for various species of baleen whale. Rommel and Reynolds give the estimated length of minkes at weaning. Go find the pages yourself.