Crossword solvers snog every now and then, unlike Methuselah (5)

I believe the answer is:
young
'unlike methuselah' is the definition.
The definition suggests a singular noun which matches the answer.
'crossword solvers snog every now and' is the wordplay.
I cannot really see how this works, but
'solvers' could be 'you' (the person or people solving the crossword) and 'you' is found within the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
A single letter 'g' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'then' acts as a link.
Can you help me to learn more?
(Other definitions for young that I've seen before include "Fry" , "In early life" , "At an early stage of development" , "Born recently" , "Newly-developed" .)
