Finding a value within a table

[Janet Charbula]

I have a table that consists of Age and BMI Values:
BMI_MALE
(
AGE_MOS DECIMAL(4,1)
,PCT_3_BMI_VAL DECIMAL(7,5)
,PCT_5_BMI_VAL DECIMAL(7,5)
,PCT_10_BMI_VAL DECIMAL(7,5)
,PCT_25_BMI_VAL DECIMAL(7,5)
,PCT_50_BMI_VAL DECIMAL(7,5)
,PCT_75_BMI_VAL DECIMAL(7,5)
,PCT_85_BMI_VAL DECIMAL(7,5)
,PCT_90_BMI_VAL DECIMAL(7,5)
,PCT_95_BMI_VAL DECIMAL(7,5)
,PCT_97_BMI_VAL DECIMAL(7,5)
)

Based upon column (Age_mos) and their BMI...I want to identify which column they fall in.
For example, if a person is 27mos old and their BMI is 15.60...I want to compare those values and find the correct Percentile column they would fall in. This is a very large table so Case Statements and compares are too cumbersome.
I have attached an example of what the table looks like. Based on my example they would fall in the 50th Percentile.
Help! Thanks in advance.