IELTS: Charity among UK people between 1990-2010 in five age groups

The bar chart show data about the proportion of UK people giving money to charity by age range between 1990 and 2010.
It made up of 5 age groups (18 to 25, 26 to 35, 36 to 50, 51 to 65 and 65 plus).

We can see from the year 1990.
Firstly, about 17% at the age of 18 to 25. Secondly, age of 26 to 35 were twice as high as age of 18 to 25.
After that it peak at age of 36 to 50, approximately 42%.
Finally, it decline to 35% and 32% at the age 51 to 65 and 65 plus, respectively.

Compare to the 1990. In 2010, It were slight about 7% at the age 18 to 25.
Following that jumped to 31% and 35% at the age 26 to 35 and 36 to 50, respectively.
It reach the highest level around 39% at age of 51 to 65.
In the end, it dropped to 35% at the age of 65 plus.

It is clear the most of proportion for UK people giving money to charity in 1990 were age of 36 to 50, and in 2010 were age of 51 to 65.

The lowest giving money to charity all at age of 18 to 25.

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First of all, I suggest you to read sample answer for writing task 1 to learn about appropriate pattern. you can visit at ielts-simon.com or other source. Secondly, make sure you have written overview after introduction paragraph. In writing task 1, overview is the most important rather than conclusion (read writing band descriptor for writing task 1).

You don't need to list so many details and you must describe the main feather firstly.

The bar chart showpresents data about the proportion of UK people giving money to charity by age range between 1990 and 2010.

bar chart shows / bar charts show ... pay attention to this grammar fix

You need to pay lots of attention to the approach you have followed for this task. If not you may fall in trouble :(
Write an introduction (should be very brief - What you've done above is fine). Then write an Overview that tells the reader about the major trends of the graph or chart. Here you should not include any details like data,figures or percentages. Then move into Detailed paras where you talk about trends with supporting data.