The policy, and you money, is gone. You have to buy a new term policy based on the rates at that time. The rates go up as you get older so at the end of a 20 year term policy, you are twenty years older. You won't be paying the rate you did twenty year ago.
In the case of my kids and their whole life policies, they won't have that worry. Their premiums were established when they were born and their premiums will remain the same regardless of how old they are.
You've lost a little in translation..
Today, she may need close to million in insurance.. (probably less but work with me).
20 (or 30) years from now she will NOT need one million dollars in life insurance.. Maybe only half or less.. Buy, or renew (no physical required) your current term at a lower payout. Your payments MAY remain the same.
Bottom line, if she NEEDS a million dollars in coverage most people can't afford that much coverage in whole life.
I believe the Canadian Insurance whatever did some research years back and found 85% of families were underinsured because they were sold on the "cash value" and were using their insurance as an investment not for insurance.
Take the example: You have 50K in whole life, what you think are GREAT return values (dream sheets are based on 10 - 12% returns when the actual return could be as low as 2% or less per year). The insured dies.. You pay for the funeral, you pay off his car note, what do you have left to live on? 10 - 15K?? MAYBE? How long is that going to last? Kids College?
Now your facing the loss of your house because you can't cover the payment without his/her paycheck..
So not only have you lost a loved one, your life is going to be turned upside down financially, AND you've lost your retirement investment.
Whole life, and even universal life is good for ONE person, the insurance salesman.. They will steer you away from term as they get HUGE commissions from both whole and Universal Life, and with the Universal Life they get TWO commissions, one for your insurance, and a commission every month on your "investments". Whole life they get commission regularly for 10 - 20 years, every time your policy renews (on the anniversary date) Better to buy term, and go get your own no load investment tools..