Both can be correct. Just depends on the timeframe you are talking about.
Mine is correct 100%.
2021-2022 1st year
2022-2023 2nd year
2023-2024 3rd year
2024-2025 4th year
2025-2026 5th year.....
PS5 finished fully 36 months on the market which is 3 year at the end of 2023. PS5 is now in its 4th year as of beginning of 2024.
But I understand people taking 2020 two months as one year
Never saw that even when PS4 launched. Everybody knows 2 months isn't a year.