Hi sadey,
The New State Pension was introduced on 6 April 2016 and the number of qualifying years rose from 30 to 35.
The other main difference is that contracted out D rate of National Insurance contributionss (NICs) was also abolished and were no longer treated as like for like as A rate deducted NICs.
This may be the reason to why more qualifying years are required. You may wish to contact the DWP for a pension forecast, you can do this on line here:
Check your State Pension forecast
Thank you.