How to change rows into columns?

Question

Let's say I have a data that looks like this:

Year	Age	Marks
1921	1	100
1921	2	89
1922	1	35
1922	2	24
1923	1	19
1923	2	15

Then,I want to change the table into this:

Age	1921	1922	1923
1	100	35	19
2	89	24	15

I couldn't figure out the codes in R Programming to change the structure of my data since I am still new to this. Thank you in advance.