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Yes, you can seal an old concrete floor as long as you remove stains and repair damage before sealing. Remove everything from the garage and clear the floor throughout with a concrete cleaner and power washing. Fill in cracks larger than 1/8 of an inch wide and remove all grease and rust stains before sealing. Make sure your concrete is fully dried before applying sealer.

The amount of paint needed to cover a two-car garage floor depends on the surface area and the product's coverage rate. On average, a standard two-car garage floor measures 400 to 500 square feet. Coverage ranges from 100 to 200 square feet per gallon for epoxy paint, depending on the product and application method. After some quick math, you may need 2 to 5 gallons of epoxy paint with two coats to cover a two-car garage floor. 

Whether it's better to stain or paint concrete depends on your budget, desired aesthetic, and DIY skill level. Generally, staining is a more durable option because the stain soaks into the concrete's surface and won't wear away like a topical paint coating. Painting concrete can trap moisture underneath the paint layer, which may cause the concrete to deteriorate over time. However, concrete paint offers a wider variety of colors, is typically easier and less expensive to apply, and is effective at covering up existing stains or blemishes on the surface.

When properly installed and maintained, concrete floors can last from 50 to 75 years or more. The longevity depends heavily on the finish and maintenance routine. For example, polished concrete floors can last 50 years or longer but require periodic refinishing or resealing every 5 to 20 years, depending on foot traffic. To maximize the lifespan of any concrete floor, it's crucial to have it installed by a licensed professional, ensure it is properly sealed to prevent damage, and perform annual deep cleanings.