Picture taken from ALVINOLOGY[Link]. It is a little morbid but if you use the Google auto-search suggestion for "When will", the 1st one on the list is when will the great man leave us, Google's autosearch suggestion is based on the frequency of search phrases. Apparently, the one about MM Lee is the most frequently asked question by Singaporeans. I do not wish our MM ill although I disagree with many of his ideas.
If you want the cold scientific answer to this question, it can be found in an actuarial life table[Link]. The quick way to work out the probabilies is to look at collumn 3. Column 3 shows the number of people still living starting with 100,000. When you're at age 87, 24000 people will be left. When you get to age 92, only 10,000 remain i.e. more than half the men who make it to 87 will not get to 92. When a man age 87, you have roughly a 13% chance of going the next year and that rises with every year.
MM Lee has worked very hard all his life. Whether you agree with him or not, his impact on our lives has been great. Although he once said he will rise from the grave [lLink] if something goes wrong with Singapore, it is time we start learning to live life without him around simply because he cannot be around forever....and this is the one cold hard truth that cannot be avoided.