Congratulations! For the first 12 months most premature babies are corrected, some are corrected beyond that depending on how premature they were and how they are going developmentally.

DS1, 30+1, is nearly 4 and is still assessed on his corrected age not his chronological age, despite being told they would stop correcting at two. He is still quite delayed in most areas, so that's why he is still being corrected. He still attends the neo-natal follow-up programme from premature babies.
DS2, 34+3, is 19 months old and has never been corrected. He has never seen a developmental paediatrician, all his assessment are done through the CHN. He is delayed in communication and personal-social skills.

DS1 pretty much did everything for corrected age (or later for some things) where DS2 did a lot of things for chronological age (he was walking at 11.5 months actual age).

Try not to stress, every child is different and does things at different rates