530645

Your HDB block at postal code 530645 (Blk 645 Hougang Avenue 8) was completed around 1986, so your flat is approximately 39 years old as of 2025, assuming it is an original unit in the block.

If you want the precise age for official purposes, you can:
- Check the lease commencement year stated in your flat’s HDB documents, then subtract that year from the current year.
- Use EdgeProp Singapore’s page for Blk 645 Hougang Avenue 8 to see project details such as completion / lease information, then derive the age from there.