Such ages may be tense (5)
I believe the answer is:
teens
'such ages' is the definition.
'teens' can be an answer for 'ages' (I've seen this in another clue). I'm not sure about the 'such' bit.
'may be tense' is the wordplay.
'may be' is an anagram indicator.
'tense' anagrammed gives 'TEENS'.
Can you help me to learn more?
(Other definitions for teens that I've seen before include "seven-year period" , "13-19 age group" , "The years 13 to 19" , "children" , "Between 12 and 20" .)