Not too long ago, people began investing in their mid-30s. Now, it’s common to see kids investing in their late teens.

The old rule of thumb used to be that you should subtract your age from 100 - and that's the percentage of your portfolio that you should keep in stocks. For example, if you're 30, you should keep ...

Jill doesn't start investing until age 35. She also contributes $200 per month, but by 65, her portfolio is only worth about $245,000. By waiting 10 years ... When stock prices decline, you ...

The table below shows the monthly investment needed to build a $1 million portfolio over 25 years assuming the market delivers an annualized return between 8% and 10%. Data source: Calculations by ...