Adjustable custom age group parameters

[paugre]

Thank you for this handy map.

It would be great to have the option to filter shown incidence rates by custom age ranges, such as for example 6-12 years to capture largely unvaccinated school age populations.

It would be great to have the option to define custom age groups.

[semohr]

Please have a look into closed issues before you open a new one
Duplicate of #5

There is no way to implement the requested feature!

[semohr]

Also duplicate of #15