It depends.
If you want to show percentage shares for various categories, the answer is probably a pie chart. Eg what percentage of the population is aged 0-10, 11-20, 21-30 etc.
A line graph would be better for tracking a percentage over time - eg what percentage of the population was over the age of 60 in 1910, 1920, 1930, etc.
If, you wanted to compare the over 60s' percentages across countries, then [vertical] bars would probably be best.
There is no fixed rule. Under different circumstances, different solutions are best.
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Pie chart
A scatter graph.
360% is the total percent. its what all the pieces of a circle graph should add up to!
pie graph
It is: 5%