You can sell your condo and then buy a new 2 room BTO flat for $100k. If you sell your condo at $900k, you will have $800k in hand. If you live up to the age of 85, you will have 20 years of retirement if your retirement start at 65. So, you can spend $40k pa or $3.3k pm. Your CPF Life will give $3.6k and your children will give $1k pm. In total, you have $7.9k pm. You only need $3k pm so you can save the rest for you to go holidays around the world.