The F-14 was based off tech that was state of the art in the late 60`s. Was designed around the engines and AWG-9 radar and fulfilled the Navy`s need
for a long rang carrier based interceptor not a dogfighter. At low speed with the wings out it could turn better than a Phantom but the F-15 could fly
circles around a F-14.
Carrier aircraft go thru alot more stresses than land based even if you baby the crap out of them the structure eventually wear out. Once that becomes
a realization the Navy choose to develop a new fighter that could do the same job plus some and that was smaller, more full efficient(as if it matter
with after burners

) and could carry all the new weapons rather than spend even more to refit the F-14s.