Age: 42, 40.
Married couple with two children (g9,b6).
We earn $860K (assessable income for YA2016) so around $71.6K a month but more than 30% of the total comes from discretionary bonus. We save $31k pm.
Home: Leasehold terrace worth $2.1m. Mortgage outstanding $1.6m. Mortgage instalment $5500 pm using cash (up to 2015, home was a hdb fully paid up worth $800K, now rented out at $2.8k per month and for offsetting the mortgage payment)
6-yr old car fully paid up (ard $80k value).
Liquid assets (cash/CPF/investments) $2.8m
Illiquid assets (pty invts [2 local 3 foreign pties], unvested stock awards, cash value of ins policies) net value $2m
Total net worth around $5.3m

I know we are very comfortable compared to general population and this post is not to brag. My main concerns are:

a) now past 40 yrs old, how long can I continue earning current salary (I hope to retire at 60 by which time hopefully can get to $10m n/w)

b) kids are still relatively young, and education is quite stressful (for them and for us), concerned about their future (ins coverage around $8m so not worried financially if I die but more about whether they can survive in this uncertain world)

c) trying to build and increase annuity streams to match my salary (still long way off) but dividends/interest/cap gains now can just cover expenses (abt $15K per mth)

d) still supporting elderly parents (in their 80s) and being mentally prepared for the emotional roller-coaster that I will go thru shortly in terms of their failing health and future demise.