ey there! It's tough to answer this question, as it will vary from investor to investor.
For example, one investor may have a high level of risk tolerance and would choose to invest in a higher equity allocation and maybe more growth stocks. Whereas someone with lower risk tolerance may go lower equity allocation and align more to fixed income options, and go with income stocks instead of growth.
Age is often misconstrued as the determining factor for risk tolerance. Those who are 20 figure they always have to be high risk because it's been preached, and those who are in their 50's always believe they have to reduce risk because it's been preached. However, it's ALWAYS up to the individual investor.
It's no use for a 20 something to invest in high risk securities just because there is a generic assumption that they should. If they're going to panic and sell out when the market takes a dip and their portfolio is wildly volatile because they don't have the risk tolerance to stomach it, they were better off just going lower risk initially.
Figure this out first, and you'll have a MUCH easier time developing a portfolio. Lots of people who skip through this step make big mistakes, or they're portfolios are severely misaligned to their goals and values.