Forest elephants have a lifespan of about 60 to 70 years and mature slowly, coming to puberty in their early teens. Bulls generally pass puberty within the next year or two of females. Between the ages of 15 and 25, bulls experience "musth", which is a hormonal state they experience marked by increased aggression. The male secretes fluid from the temporal gland between its ear and eye during this time. Younger bulls often experience musth for a shorter period of time, while older bulls do for a longer time. When undergoing musth, bulls have a more erect walk with their heads high and tusks inward, they may rub their heads on trees or bushes to spread the musth scent, and they may even flap their ears, accompanied by a musth rumble, so that their smell can be blown towards other elephants. Another behavior affiliated with musth is urination. Bulls allow their urine to slowly come out and spray the insides of their hind legs. All of these behaviors are to advertise to receptive females and competing bulls they are in the musth state. Bulls only return to the herd to breed or to socialize, they do not provide prenatal care to their offspring but rather play a fatherly role to younger bulls to show dominance.