Web.com has merged the SnapNames and NameJet inventories. So when you do a search for NameJet, SnapName domains will show up, and vice versa.
We have three separate age metrics for every domain

1. Domain Age (WayBack) - This is the age taken from the Wayback Archive. The Wayback Archive gives the age based on when it first crawled any pages on the domain. From an SEO perspective, the age from Wayback Archive is more relevant since its more likely that the search engines would use a similar measure.

2. Domain Age (WhoIs) - This is the age taken from the WhoIs data. The WhoIs data gives the age based on when the domain was initially purchased. If a domain drops and is then registered, the WhoIs date will reset.

3. Website Age (WayBack) - This is the age of the last website that was on the domain. To understand this let us take an example of a domain that was registered in 2005 and had a website running on it till 2010. Then the domain was abandoned till 2012, when a new website was placed on the domain till 2015 (present time). Our systems will find out the break of 2 years and will therefore calculate the Website Age to be only 3 years (While the Domain Age shown above will be 5 years).