Second childhood and Years

Second childhood noun - Mental infirmity as a consequence of old age; sometimes shown by foolish infatuations.

Years and second childhood are semantically related. in period of being elderly topic. In some cases you can use "Years" instead a noun phrase "Second childhood".

Years noun - A prolonged period of time.

Second childhood and years are semantically related. Sometimes you can use "Second childhood" instead a noun "Years".