How to create dynamic custom segments?

[garfieldm]

I have a data source like this:

ID	Product	Age
1	Amazon	18
2	Google	19
3	Facebook	20
4	Apple	21
5	Apple	22
6	Google	23
7	Amazon	25
8	Google	25
9	Facebook	27
10	Apple	29
11	Apple	28
12	Google	31
13	Amazon	32
14	Google	33
15	Facebook	34

And I want to create custom age segments like this (My visualization should look like this):

	Product
Custom Age Group	Amazon	Facebook	Google	Apple
18-21	1	1	1	1
22-25	1	0	2	1
26-30	0	1	0	2
31-34	1	1	2	0

The user should be able to dynamically set the age groups.

For example, if the user wants to look at 18-25 and 28-34 age groups, the user should be able to make the changes on their own. Is this possible?