ext4 filesystems larger than 16T

I have a LVM based ext4 filesystem on RHEL 5.4. The LV is just over 21T, but I am unable to extend the filesystem past the 15T that it is currently using.
I get this error from resize4fs:

resize4fs 1.41.5 (23-Apr-2009)
resize4fs: File too large while trying to determine filesystem size


--- Logical volume ---
LV Name /dev/ProgramArchive/ProgramArchive01
VG Name ProgramArchive
LV UUID g7Ndek-tZzc-irZX-7yiB-pbAC-NCHZ-7QetqV
LV Write Access read/write
LV Status available
# open 1
LV Size 21.82 TB
Current LE 5720062
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:6

I guess large filesystem support still is not present in ext4? I this the case, or do newer versions of the ext2/3/4 tools permit growing a filesystem past 16T?

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