How to put the current year in the date of birth instead of the year of birth?

Question

Google Sheets

There is a record of the date of birth in the form 05101976.
Task: How to insert the current year instead of the last four digits (year of birth) to get a record in the adjacent cell 05102020?
Next year it is necessary that the year of birth is replaced by 2021 and there is an entry 05102021.
Is this possible at all ??
There is an example in the spreadsheet:
https://docs.google.com/spreadsheets/d/1vqKnsN_8qQ...

Answer 1

=left(<cell with date>,4) & year(now())