Ping TTL (Time To Live) question

Ping TTL (Time To Live) question: "As we all know, TTL is the maximum number of 'hops' that the ICMP packet will make before dyeing. Sometimes when the ICMP finally reaches its destination, the TTL is reset to the recipient host's default TTL and is then sent back.

This makes sense because when I tracert yahoo.com I get 18 hops, so 53 + 17 = 70 (yahoo.com's default TTL)"