If you do have tile mastic down from the before the 1980s I would say just go for broke and hire a professional team to remove it. While some say don't take it out until it is cracking and unattractive, I say why wait until the asbestos spreads around your home.
Asbestos is a nasty compound, which can cause scarring to the lungs if inhaled and cancer. This kind of damage to your body is just not worth waiting to replace something like your floors.
Asbestos removal, especially in something like tile mastic, can get pricey so it is best to shop around when you do make the move to get it out of your home.