Definitely there are always factors to consider when starting out investment, most importantly having the financial capacity of having a discretionary income, so when we consider our situation in life could be more of financial availability and being able to afford our expenses and paying our bills which are primary and essential needs as well, I really don’t think that we should consider our age when we want to start investing in Bitcoin, life is always full of uncertainty, considering that we’ve a discretionary income and we can continue to accumulate Bitcoin on a regular basis, marriage and all that are just all a bonus and also will still have to deal with our financial situation and expenses.
It could be an issue. To give you some context, if a person is 70 years old and he/she has enough money to enjoy the few years he/she has left, I believe investing in Bitcoin should be the LAST goal he/she should plan for himself/herself.
Compare that to a young individual in his/her 20s who has been saving MOST of his/her salary. If that individual is given an opportunity to invest in the lowest DIPs of a bear cycle, then he/she SHOULD use ALL of his/her savings.
I think you are right about what you said here concerning age, it plays an important role on how a Bitcoin investment should approach his investment, just as you have said already, you can't expect a 70year old Bitcoin investor still planning on holding for more than 10 years because he knows that he has a limited time, unlike those that are in their 20's.
But those in their 20's don't have to buy only the dip, they just have to buy anytime their discretionary income is available, but if their is a dip in the market they might seize the opportunity and buy aggressively if they have their reserves funds to do so, because they have quite a lot of time to reap from their investment when bitcoin has risen up to a million dollar or more.
The earlier the better since it will bare more good result if they invest at earliest age.
But that depends on what age they know Bitcoin since not everyone is lucky to know this coin so early.
Still they can do good decision by investing on Bitcoin right away then do HODL with it. Somehow they can decide to do 5,10 years or maybe longer than that especially if they are young.
If they are at 70's still they can buy Bitcoin and for inheritance purposes. Nothing stop people to do it since it can give good fortune to their recipients. This is how cool Bitcoin is since its flexible and we can use it on whatever purpose we are aiming for investing on this coin.