'How graph specific data set in R?

I have a data frame as follows:

SVD <- structure(list(age.group = c("15-19", "20-24", "25-29", "30- 
34","35-39", "40-44", "45-49"), a = c(0.113152976, 0.302890507, 
0.274024612, 0.175444951, 0.09657695, 0.033532932, 0.004377071), b = 
c(0.107349538, 0.36591275, 0.244849695, 0.153582407, 0.094900555, 
0.030508273,0.002896782)), class = "data.frame", row.names = c(NA, 
-7L))

I need to plot them based on age groups. The final graph should be something like the ensuing graph:

enter image description here



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