Vintage

The year of fund formation and/or its first takedown of capital. By placing a fund into an particular vintage year, the Limited Partner can compare the performance of a given fund with all other similar types of funds form in that particular year.

Source: https://ilpa.org/glossary/vintage-year/

Apliqo LP PM uses the commencement date - the date which the fund begins operations -

to determine the vintage for a fund.