The simple rule
For someone whose record began entirely under the new system, 35 qualifying years usually produces the full new State Pension and at least 10 years are normally needed for any payment.
Why older records are different
When the new State Pension began in April 2016, the government calculated a starting amount using both the old and new systems. Contracted-out workplace pension history can affect this calculation, so two people with the same number of years can have different forecasts.
What to rely on
Use your official forecast to see what you have built up, what you could receive if you continue contributing and whether more years can improve it. Treat a calculator as a scenario tool, not a replacement for that individual record.
A better question
Instead of asking “Do I have 35 years?”, ask “Will this specific missing year increase my forecast?” That question prevents the most expensive mistake: paying for a year that adds nothing.