I was four years old at the time.
( I ( ( was ( ( four years ) ( old ( at ( the time ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD was) (ADJP (NP (CD four) (NNS years)) (JJ old) (PP (IN at) (NP (DT the) (NN time))))) (. .)))
I was 25 years old in 2020.
( I ( ( was ( ( 25 years ) ( old ( in 2020 ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD was) (ADJP (NP (CD 25) (NNS years)) (JJ old) (PP (IN in) (NP (CD 2020))))) (. .)))