Testosterone is inversely related to age which means that the number of testosterone decreases. There are many other factors responsible for the lower testosterone levels in men such as stress, smoking, drinking alcohol, inactive lifestyles and unhealthy eating habits.
It is ok to contact this poster with commercial interests.
1) Do NOT send money for shipping the pet from abroad, they are scams.
2) Beware the seller or buyer who is from overseas.
3) Avoid bank wire service and western union because they has no buyer protection.
4) The safety way is to deal locally with people you can meet in person.
5) More about How to Avoid SCAMs.