Sealing asphalt does not extend the life of the pavement, but it will make it look nicer and it will help to protect it from weathering. The main benefit of sealing asphalt is that it will help to keep the pavement in good condition so that you won't have to repair or replace it as often.

It depends on what you mean by "sealing asphalt." If you are talking about applying a sealant to the surface of the asphalt, then the answer is yes, it can extend the life of the asphalt. Sealing asphalt helps to protect it from weathering and UV damage, which can cause it to deteriorate over time. Applying a sealant can also help to prevent cracks from forming in the surface of the asphalt.